IBM 3278 - Interrupt;Status Register (2 D0)

Interrupt/Status Register (2DO)
This 8-bit register on the emulation adapter is accessed by the
IBM Personal Computer. Bits
0 through 5 are Interrupt (I) bits,
which are set
by the emulation adapter and reset by the IBM
Personal Computer. Bits 6 and 7 are
Status (S) bits, which are set
and reset
by the adapter.
Note: Interrupt
Level-2 is used by the emulation adapter.
Bit I/S
Function
0
I
Keystro ke Accepted
1 I
Reset Command Decoded
2
I
Visual/Sound Register Updated
3
I Reserved
4
I
Base Buffer Modified Complete
5 I
Load I/O Address Command Decoded
6 S
Buffer Being Modified
7 S
Interrupt Generated
Interrupt/Status Register
1-4